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To get back to the notion of annotating space -- I would argue that people will annotate space much like they annotate the web, or annotate their photos... More in a notebook sense, a journaling sense. The annotations are explicitly *not* "meant for other people" -- they're meant for yourself, they only have to make sense for yourself, and if others stumble across them, great, fine.

I'm surprised by how many people will provide book reviews on Amazon, movie reviews on IMDB, restaurant reviews on Citysearch, etc. These people are using reviews as a way to both share with a larger community and to do some journaling for themselves. It's similar to traditional blogging. A friend of mine and I started a website a couple months ago to allow people to describe places in San Francisco using blog-like entries, maps, tags, and photos. Initially, we thought that people would use the site primarily to criticize or review places but instead the posts have largely migrated towards journaling, as you suggest here.